Digital audio interface - Part 5: Consumer application enhancement

IEC 60958-5:2021 enhances the consumer application of the interface for the interconnection of digital audio equipment defined in IEC 60958-1 and IEC 60958-3, introducing:
- multichannel;
- multi-stream;
- high-resolution;
- multimedia extension;
- related applications.

Interface audionumérique - Partie 5: Amélioration de l'application grand public

L'IEC 60958-5:2021 a pour objet d'améliorer l'application grand public de l'interface destinée à l'interconnexion des appareils audionumériques définis dans l'IEC 60958-1 et l'IEC 60958-3, en introduisant les améliorations suivantes:
- voies multiples;
- multiflux;
- haute résolution;
- extension multimédia;
- applications connexes.

General Information

Status
Published
Publication Date
02-Feb-2021
Current Stage
PPUB - Publication issued
Completion Date
03-Feb-2021
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IEC 60958-5
Edition 1.0 2021-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Digital audio interface –
Part 5: Consumer application enhancement
Interface audionumérique –
Partie 5: Amélioration de l'application grand public
IEC 60958-5:2021-02(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60958-5
Edition 1.0 2021-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Digital audio interface –
Part 5: Consumer application enhancement
Interface audionumérique –
Partie 5: Amélioration de l'application grand public
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.160.01; 33.160.30 ISBN 978-2-8322-9325-6

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 60958-5:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 7

4 Interface format ............................................................................................................... 9

5 Operation modes ............................................................................................................. 9

5.1 General ................................................................................................................... 9

5.2 Multichannel linear PCM operation mode ................................................................ 9

5.3 One-bit audio operation mode ............................................................................... 10

5.4 High-precision multi-bit linear audio operation mode ............................................. 11

6 Channel status .............................................................................................................. 12

6.1 General ................................................................................................................. 12

6.2 Application ............................................................................................................ 12

6.2.1 Channel status general format ....................................................................... 12

6.2.2 Mode 0 channel status format for digital audio equipment for enhanced

consumer use ................................................................................................ 13

7 Stream change .............................................................................................................. 16

Annex A (informative) Audio and vibrotactile applications ................................................... 17

A.1 General ................................................................................................................. 17

A.2 Channel assignments of vibrotactile signals .......................................................... 17

Annex B (informative) Audio and MIDI application ............................................................... 19

B.1 General ................................................................................................................. 19

B.2 Audio and MIDI 2.0 application ............................................................................. 19

Bibliography .......................................................................................................................... 20

Figure 1 – Example: multichannel group and subgroups ....................................................... 10

Figure 2 – One-bit audio subframe ........................................................................................ 11

Figure 3 – 32/64-bit mode subframe...................................................................................... 11

Figure 4 – 32-bit mode frame ................................................................................................ 11

Figure 5 – 64-bit mode frame ................................................................................................ 12

Figure 6 – Switching from one linear PCM audio mode to the other linear PCM audio

mode .................................................................................................................................... 16

Figure B.1 – Subframe format ............................................................................................... 19

Table 1 – Example: multichannel group and subgroups ......................................................... 10

Table 2 – Mode 0 channel status format for enhanced consumer use.................................... 13

Table 3 – Multichannel configuration ..................................................................................... 15

Table A.1 – Vibrotactile channel assignments ....................................................................... 17

Table B.1 – Audio and MIDI 2.0 order ................................................................................... 19

---------------------- Page: 4 ----------------------
IEC 60958-5:2021 © IEC 2021 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DIGITAL AUDIO INTERFACE –
Part 5: Consumer application enhancement
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

IEC 60958-5 has been prepared by Technical Area 20: Analogue and digital audio, of IEC

Technical Committee 100: Audio, video and multimedia systems and equipment. It is an

International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
100/3449/CDV 100/3517/RVC

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.
---------------------- Page: 5 ----------------------
– 4 – IEC 60958-5:2021 © IEC 2021

A list of all parts in the IEC 60958 series, published under the general title Digital audio interface,

can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 60958-5:2021 © IEC 2021 – 5 –
INTRODUCTION

IEC 60958-3 edition 1.0 was released in 1999 specifying the consumer applications of the

interface for the inter-connection of digital audio equipment defined in IEC 60958-1. The

applications have enhanced their quality including multichannel modes, high-precision bit length,

and multi-stream modes. These enhancements imply a new part in the IEC 60958 series,

appropriately keeping backward compatibility with IEC 60958-3 and providing a new enhanced

digital audio interface.
---------------------- Page: 7 ----------------------
– 6 – IEC 60958-5:2021 © IEC 2021
DIGITAL AUDIO INTERFACE –
Part 5: Consumer application enhancement
1 Scope

This part of IEC 60958 enhances the consumer application of the interface for the

interconnection of digital audio equipment defined in IEC 60958-1 and IEC 60958-3, introducing:

– multichannel;
– multi-stream;
– high-resolution;
– multimedia extension;
– related applications.

NOTE IEC 60958-3 specifies a consumer application to carry stereophonic programmes with a resolution of up to

24 bits per sample. This part of IEC 60958 enhances the application, allowing programmes with up to 64 channels,

64 bits per sample, and two simultaneous streams.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.
IEC 60958-1:20— , Digital audio interface – Part 1: General
IEC 60958-3:20— , Digital audio interface – Part 3: Consumer applications

IEC 62574:2020, Audio, video and multimedia systems – General channel assignment of

multichannel audio

ISO/IEC 23001-8:2016, Information technology – MPEG systems technologies – Part 8: Coding-

independent code points
ITU-R BS.2094-1:2017, Common definitions for the audio definition model
ITU-R BS.2051-2:2018, Advanced sound system for programme production
—————————
Under preparation. Stage at the time of publication: IEC CCDV 60958-1:2021.
Under preparation. Stage at the time of publication: IEC CCDV 60958-3:2021.

This publication was withdrawn and replaced with ISO/IEC 23091-3:2018, ISO/IEC 23091-1:2018 and ISO/IEC

23091-2:2019.
---------------------- Page: 8 ----------------------
IEC 60958-5:2021 © IEC 2021 – 7 –
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
one-bit audio
one-bit length audio data stream

Note 1 to entry: A one-bit audio data stream can be directly played back through the analogue low-pass filter bit by

bit (MSB first).
3.2
high-precision multi-bit linear audio
linear PCM audio data longer than 25 bits length per sample
Note 1 to entry: This document supports 32- and 64-bit lengths.
3.3
sampling frequency
frequency of the samples representing an audio signal.

Note 1 to entry: When more than one signal is transmitted through the same interface, the sampling frequencies

are identical.
[SOURCE: IEC 60958-1:20—, 3.1]
3.4
audio sample word
value of a digital audio sample
Note 1 to entry: Representation is linear in 2's complement binary form.

Note 2 to entry: Positive numbers correspond to positive analogue voltages at the input of the analogue-to-digital

converter (ADC).
[SOURCE: IEC 60958-1: 20—, 3.2]
3.5
channel status

data carrying, in a fixed format, information associated with each main data field channel, which

is decodable by any interface user.

Note 1 to entry: IEC 60958-3 specifies the mode 0 channel status format for digital audio equipment for consumer

use.
EXAMPLE 1 Length of audio sample words.
EXAMPLE 2 Sampling frequency.

[SOURCE: IEC 60958-1:20—, 3.5, modified – Modification of the Note to entry, and addition of

two examples.]
3.6
preamble
specific patterns used for synchronization.
---------------------- Page: 9 ----------------------
– 8 – IEC 60958-5:2021 © IEC 2021
Note 1 to entry: There are three different preambles: “B”; “M”; and “W”.
[SOURCE: IEC 60958-1:20—, 3.8, modified – Modification of the Note to entry.]
3.7
sub-frame
fixed structure used to carry information
[SOURCE: IEC 60958-1:20—, 3.9]
3.8
frame
sequence of two successive and associated sub-frames
[SOURCE: IEC 60958-1:20—, 3.10]
3.9
block
group of 192 consecutive frames

Note 1 to entry: The start of a block is designated by a special sub-frame preamble.

[SOURCE: IEC 60958-1:20—, 3.11]
3.10
channel number
number that shows channel order in two-channel operation mode
3.11
channel label ID
label of ID
[SOURCE: IEC 62574:2020, 3.73]
3.11.1
multichannel number
number that identifies multichannel addressing
Note 1 to entry: Same as IEC 62574 channel number
3.12
multichannel group
group composed of one or two multichannel subgroups
3.13
multichannel count
count of channels in a multichannel group
3.14
multichannel subgroup
subgroup, in a multichannel group, composed of several multichannel

Note 1 to entry: Multichannel subgroup A is set according to multichannel configuration.

Note 2 to entry: Multichannel subgroup B is set according to multichannel map.
3.15
multichannel configuration
configuration of multichannel addressing
---------------------- Page: 10 ----------------------
IEC 60958-5:2021 © IEC 2021 – 9 –
3.16
multichannel order
order of multichannel in a multichannel group
3.17
multichannel map
map of multichannel selections
4 Interface format

The interface format as defined in IEC 60958-1 and IEC 60958-3 shall be used unless otherwise

specified in this document.
5 Operation modes
5.1 General

IEC 60958-1 specifies single- and two-channel operation modes. This document introduces

several new operation modes based on the same interface format of IEC 60958-1 without the

pre-emphasis function defined in IEC 60958-3. Channel status information identifies these

modes in operation. This document shares the information with IEC 60958-1 and IEC 60958-3

and specifies new usages.
5.2 Multichannel linear PCM operation mode

In multichannel linear PCM operation mode, the samples taken from multichannel linear PCM

are transmitted by time multiplexing in consecutive sub-frames.

A multichannel group is composed of several multichannel by consecutive frames. The number

of multichannels included in the group is identified by the multichannel count of channel status

bits 44 to 47. The group starts with preamble “B” and repeats itself with no break in the block

and without un-grouped frames. The group is divided into one or two multichannel subgroups

by the multichannel configuration of channel status bits 49 to 60 and the multichannel map of

channel status bits 64 to 165. The subgroup is composed of some specific multichannels by

consecutive sub-frames. Each multichannel within the multichannel subgroup B is re-numbered

according to the multichannel number of channel status bits 64 to 165. Each channel carries

consecutive audio sample words.

An example is shown in Figure 1 and Table 1. The multichannel group is composed of eight

multichannels. This number of eight is identified by the multichannel count value of “1110”. The

multichannel subgroup A is composed of three multichannels identified by the multichannel

configuration value of “100001010000”, which includes FrontLeft channel, FrontRight channel

and FrontCenter channel given in ITU-R BS.2094-1. The multichannel subgroup B is composed

of the 77 multichannel (channel label ID name of HFL) and 78th multichannel (channel label

ID name of HFR) by setting the channel status bit 77 to “1” and the channel status bit 78 to “1”.

Channels of multichannel order 6, 7 and 8 are not used in this example.
---------------------- Page: 11 ----------------------
– 10 – IEC 60958-5:2021 © IEC 2021
Figure 1 – Example: multichannel group and subgroups

The sampling frequency of each audio multichannel is identical and identified by the original

sampling frequency of channel status bits 36 to 39. The sampling frequency of channel status

bits 24 to 27, 30 and 31 identifies the IEC 60958 frame rate in operation.
Table 1 – Example: multichannel group and subgroups
Preamble Channel Multichannel Multichannel Multichannel subgroup B
number order subgroup A
ITU-R BS.2094-1; Multichannel map C‑Bit 64‑191;
audioPackFormatID, Multichannel number value:
audioChannelNames Channel label ID name
B 1 1 AP_0001000a
FrontLeft
W 2 2
FrontRight
M 1 3 FrontCenter
W 2 4 77: HFL
M 1 5 78: HFR
W 2 6
M 1 7
W 2 8
M 1 1 AP 0001000a
FrontLeft
W 2 2
FrontRight
M 1 3 FrontCenter
W 2 4 77: HFL
M 1 5 78: HFR
W 2 6
M 1 7
W 2 8
M 1 1 AP_0001000a
⁞ ⁞ ⁞ ⁞ ⁞
M 1 7
W 2 8
AP 0001000a
B 1 1
FrontLeft
M 2 2
FrontRight
W 1 3 FrontCenter
5.3 One-bit audio operation mode

In one-bit audio operation mode, the samples taken from multichannel one-bit audio stream are

transmitted by time multiplexing in consecutive sub-frames. The sub-frame format is shown in

Figure 2.
---------------------- Page: 12 ----------------------
IEC 60958-5:2021 © IEC 2021 – 11 –
Figure 2 – One-bit audio subframe

Time slots 4 to 19 carry on-bit audio samples composed of 16 bits of the consecutive one-bit

audio stream. Significant bit (MSB) is carried by time slot 19.

Time slots 20 to 17 are not used; they are filled with zeros or a few fixed patterns and ignored.

The frame format as defined in multichannel linear PCM operation mode is used for

multichannel one-bit audio operation mode.

The sampling frequency of each one-bit audio channel is identical and identified by the original

sampling frequency of the channel status bits 36 to 39, which is 16 multiples of that of the

multichannel linear PCM. The sampling frequency of channel status bits 24 to 27, 30 and 31

identifies the IEC 60958 frame rate in operation. IEC 60958-3 defines the original sampling

frequency where one-bit audio multiples 16 and sampling frequency as the IEC 60958 frame

rate.
5.4 High-precision multi-bit linear audio operation mode

In the high-precision multi-bit linear audio operation mode, the samples taken from the

multichannel high-precision multi-bit linear audio are transmitted by time multiplexing in

consecutive sub-frames dividing of word. The sub-frame format of 32/64-bit mode is shown in

Figure 3. The frame formats are shown in Figure 4 and Figure 5.
Figure 3 – 32/64-bit mode subframe

In 32-bit audio operation mode, time slots 4 to 19 carry 16-bit samples of 32-bit audio words.

Significant bit (MSB) is carried by time slot 19. Time slots 20 to 17 are not used; they are filled

with zeros or a few fixed patterns and ignored.
Figure 4 – 32-bit mode frame

The frame format as defined in the multichannel linear PCM operation mode is used for

multichannel 32-bit operation modes.
---------------------- Page: 13 ----------------------
– 12 – IEC 60958-5:2021 © IEC 2021

The original sampling frequency for the 32-bit mode corresponds to 1/2 of that of the

multichannel linear PCM.

In 64-bit audio operation mode, time slots 4 to 19 carry 16-bit samples of 64-bit audio words.

Most significant bit (MSB) is carried by time slot 19. Time slots 20 to 17 are not used; they are

filled with zeros or a few fixed patterns and ignored.
Figure 5 – 64-bit mode frame

The frame format as defined in the multichannel linear PCM operation mode is used for

multichannel 64-bit operation modes.

The original sampling frequency for 64-bit mode corresponds to 1/4 of that of the multichannel

linear PCM.
6 Channel status
6.1 General

The channel status format as defined in IEC 60958-1 and IEC 60958-3 shall be used unless

this document specifies.
6.2 Application
6.2.1 Channel status general format

For each IEC 60958-5 channel, the channel status block provides the information described in

this clause and summarized in Table 2.
---------------------- Page: 14 ----------------------
IEC 60958-5:2021 © IEC 2021 – 13 –
6.2.2 Mode 0 channel status format for digital audio equipment for enhanced
consumer use
Table 2 – Mode 0 channel status format for enhanced consumer use
Byte
0 a = “0” b = “0” c D Mode = “0 0”
“0 0 1”: Multichannel LPCM
“0 1 1”: refer to bit 32-35
bit 0 1 2 3 4 5 6 7
1 Category code
bit 8 9 10 11 12 13 14 15
Source number Channel number
2
bit 16 17 18 19 20 21 22 23
Sampling frequency
3 Sampling frequency Clock accuracy
extension
bit 24 25 26 27 28 29 30 31
Word length Original sampling frequency
4
“0 0 0 0”: one-bit audio
“1 0 0 0”: 32-bit audio (2 sub-frames per channel)
“0 1 0 0”: 64-bit audio (4 sub-frames per channel)
bit 32 33 34 35 36 37 38 39
CGMS-A CGMS-A Audio sampling frequency coefficient/Multichannel Count
5
validity “0 0 0 0”: 2 ch (x 1 speed)
“1 0 1 1”: 64 ch (x 32 speed)
“1 1 0 0”: 32 ch (x 16 speed)
“1 1 0 1”: 16 ch (x 8 speed)
“1 1 1 0”: 8 ch (x 4 speed)
“1 1 1 1”: 4 ch (x 2 speed)
bit 40 41 42 43 44 45 46 47
Information General channel
6 General channel assignment channel number for A channel
hidden in PCM assignment
signal channel number
for B channel
Multichannel configuration
bit 48 49 50 51 52 53 54 55
General channel assignment
7 LFE Playback level reserved
channel number for B channel
Multichannel configuration
bit 56 57 58 59 60 61 62 63
8 IEC 62574:2020 general channels
Multichannel
FL FR FC LFE LS RS FLc
map bit 65 to
191;
0: De-
activated
1: Activated
bit 64 65 66 67 68 69 70 71
IEC 62574:2020 general channels
FRc BC LFE1 SiL SiR HFL HFR HFC
bit 72 73 74 75 76 77 78 79
10 IEC 62574:2020 general channels
OhC HLS HRS HsiL HSiR HBC BtFC BtFLmid
bit 80 81 82 83 84 85 86 87
IEC 62574:2020 general channels
BtFRmid FLw FRw BL BR LBS RBS HBL
bit 88 89 90 91 92 93 94 95
IEC 62574:2020 gener
...

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